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Marine Biology Basics

Marine Biology

A quiz covering fundamental facts about ocean life, marine ecosystems, and sea creatures.

ocean science biology

15 Questions Easy Ages 13+ Oct 11, 2026

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About this Study Set

This study set covers Marine Biology through 15 practice questions. A quiz covering fundamental facts about ocean life, marine ecosystems, and sea creatures. Every question includes the correct answer so you can learn as you go — pick any format above to get started.

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Browse all 15 questions from the Marine Biology Basics study set below. Each question shows the correct answer — select a study format above to practice interactively.

1 Which of the following is the largest species of shark in the ocean?

A Great White Shark
B Whale Shark
C Hammerhead Shark
D Tiger Shark

2 What type of organism is a coral, despite often being mistaken for a rock or a plant?

A An animal
B A fungus
C A mineral
D A type of seaweed

3 Which zone of the ocean receives enough sunlight for photosynthesis to occur?

A Abyssal zone
B Hadal zone
C Photic zone
D Midnight zone

4 What do marine biologists call the process where corals expel the algae living in their tissues due to stress?

A Coral bleaching
B Coral blooming
C Coral erosion
D Coral calcification

5 Which of these marine mammals belongs to the group known as pinnipeds?

A Dolphin
B Manatee
C Walrus
D Blue Whale

6 What is the primary substance that makes up the hard exoskeleton of a crab?

A Calcium carbonate
B Chitin
C Keratin
D Silica

7 Which ocean is the largest and deepest on Earth?

A Atlantic Ocean
B Indian Ocean
C Arctic Ocean
D Pacific Ocean

8 Sea turtles are reptiles. How do they primarily breathe?

A Through gills
B Using lungs
C Through their skin
D By absorbing oxygen from water

9 What is the term for the movement of cold, nutrient-rich water from the deep ocean to the surface?

A Upwelling
B Tidal surge
C Current drift
D Thermal expansion

10 Which cephalopod is known for having three hearts?

A Squid
B Nautilus
C Octopus
D Cuttlefish

11 What do baleen whales use their comb-like plates for?

A Defense against predators
B Attracting mates
C Filtering plankton from water
D Crushing shells

12 Which of these is a microscopic, floating organism that forms the base of the marine food web?

A Zooplankton
B Phytoplankton
C Macroalgae
D Benthic detritus

13 How many legs does a typical decapod crustacean, such as a lobster, have?

A Six
B Eight
C Ten
D Twelve

14 What is the primary salt found in seawater?

A Magnesium sulfate
B Sodium chloride
C Potassium nitrate
D Calcium carbonate

15 Which marine fish is famously known for the male being the one to carry eggs in a pouch?

A Clownfish
B Seahorse
C Lionfish
D Tuna

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